Method of making armatures for dynamo-electric machines



(Niw Model.)

T. EDISON. METHOD OF MAKING ARM-ATEERBS; FOR DYNAMO ELBGTRIG M'AGHINBS.

Patented Sept.- 2, 189-0.

ing simultaneously into an annular coil a bobbin made in removablesegments, and,

UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF LLEVVELLYN PARK, NEIV JERSEY.

METHOD 'OF MAKING ARMATURES FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 435,690, datedSeptember 2, 1890. Application filed September 15, 1888. Serial No.285,526. (No model.)

Electric Machines, (Case No. 800,)of which.

the following is a specification.

The object of my invention is to provide a cheap and expeditious methodof making armatures of that class known as ring-armatures, whereby 'anexceedingly cheap and elfective form of armature is produced.

The main feature of my invention consists in forming the core of thearmature by windlarge number of separate iron wires, such wires beinginsulated from each other in a simple manner, which will be hereinafterexplained. It will be seen that in this way the core is constructed veryquickly, and I find that in a core so made the local currents aregreatly diminished in comparison with those in a core formed by windinga single length of wire. I wind the iron wire on a wooden after thebobbin is full I remove the segments one at a time and wind the spaceswith copper wire at right angles to the iron wire of the core. I thenforce the armature thus formed'onto awooden hub, securing the edges byslips of vulcanized fiber or other tough material to prevent the corefrom turning on the hub. Y

My invention is illustrated in the accompanying drawings.

Figure 1 illustrates the method of winding the iron wires on thetemporary hub. Fig. 2 is a sectional view of said hub with the'wirewound upon it. Fig. 3 illustrates the method of winding the copper wireupon the core, and Fig, 4 is a perspective view of the completedarmature. Fig. 5 shows a cross-section of an oxidizing-chamber.

The temporary wooden bobbin A consists of a hub a, mounted on'a shaft1), to the cir- 'cumferenee of which hub is secured by screws 0 a numberof segmental wooden pieces (I,

' each of which has an inward flange e, extending to the middle of theperiphery of the hub. I provide a suitable number of spools f of ironwire, which may be mountcd,as shown,

upon a table, or other support B. Enough spools f are provided tofurnish wires enough to cover the whole width of the flange s e, whichis the width desired for the armature. Thus if the armature. is to besix inches wide and the wire of one-fiftieth of an inch in diameter Iwill employ three hundred spools f. The ends of all the wires gextending from the spools f are secured in a line across the bobbin A,and this bobbin is then revolved, whereby the wires will be wound inconsecutive layers upon the bobbin, each turn of an individual wirebeing directly above the preceding turns thereof. I may provide thespools f with suitable tension devices for keep the wire taut. Iinsulate all the iron wires by passing the same through the vapor ofnitric acid or of hydrogen peroxide, whereby the surface of the wire isoxidized-or reduced to ferric oxide. This insulates the wire perfectly.This may be done by means of any suitable apparatus. In Fig. 5 is showna chamber m,containi' n g the oxidizing agent, which may be admitted orwithdrawn through valve '11,. The Wires 9 before being wound in ringform are passed vthrough the chamber, and their surfaces thus oxidized.After the bobbin A is filled with wire I remove from it one of thesegments formed by two pieces don each side, which leaves a space oneach side of and beneat-h the ring of iron wire at which the coppercircuit-wire may be wound. This is illustrated in Fig. 3, the segmentatthe top of the a ring having been removed,

whereby a space his leftfor the winding. I first wrap the coreat thisspace with insulating tape 1', and then wind upon the tape at rightangles to the iron wirethe insulated copper wire it, which is to formthe wire of the armaturecircuit. After one space is wound I remove theremaining segments one after another,

and wind each space so formed with the insulating-tape and with thecopper wireinthe same manner, suitably connecting the circuitwirestogether into a continuous coil. The

ring 0 of iron wire wound with copper wire is then forced upon a woodenhub D, having a shaft E, and slips of vulcanized fiber l are inserted innotches in the edge of the hub D to prevent the. ring'C from turning. onthe hub.

Ico

It will be seen thatin making the iron core each revolution of thewooden bobbin A covers the whole face thereof with wires laid parallel,this being continued until the bobbin is full, and each turn of one wirebeing wound directly over the preceding turns the resulting structure isanalogous to three hundred separate plates, each of which is formed ofwire, and the wire being'insulated, as described, the Foucault currentsare largely diminis hed. It also makes a more even armature, and therapidity of winding and -cheap-" ness of the operation are evidentlymuch greater than where a single wire is used. The copper wire wound onthei'ron wire at right angles to it 'efiectually binds and secures ittogether.

- Vhat I claim is- 1. The method of making armature-cores, whichconsists in simultancouslywin'ding several wires side by side into anannular coil, said wires being: sufiicient in number to constitute onelayer of the core, whereby an entire layer is made bya single winding,and continuing the. winding as many times as there are to be layers ofwire in the core, substantially as described.

2. The method of making armature-cores, which consists in simultaneouslywinding several wires side by side into an annular coil, said Wiresbeing suflicient in number to constitute one layer of the core, wherebyan entire layer is made by a single windi g, and continuing the windingas many times as there are to be layers of wire in the core, and thenwinding said coil with the circuit-Wire at right angles to the wires ofthe core, substantially as described. a

3. The method of making an armature, which consists in winding a numberof wires simultaneously upon a temporary bobbin into an annular coil,removing said bobbin, and

winding said coil with the circuit-wire at right angles thereto,substantially as set forth.

4. The method of making an armature, which consists in winding wire intoan annular coil upon a temporary bobbin made up of removable segments toform the core, removing said segments one at a time, and WlDdlllg thespace occupied by each segment with the circuit-wire at right angles tothe Wire of the core, substantially as set forth.

I 5. The method of making an armature, which consists in "winding anumber of wires simultaneously upon a bobbin made up of removablesegments into an annular coil to formthe core, removing said segmentsoneat atime, and winding the spaces occupied by the segments with thecircuit-wire at right angles to the wire of the core, substantially asset forth.

6; The method of making an armature,

' which consists inflwinding a number of-wires simultaneously into anannular coil, winding the circuit-wire thereon at right angles to thewire of the core, and forcing the whole upon a hub, substantially as setforth.

7. The method of making an armature, whichconsists in winding wire upona bobbin made up of removable segments to form the core, removing saidsegments one at a time and winding the circuit-wire in the spacesoccupied by the segments at right angles to the wire of the core, andthen forcing the whole upon a hub, substantially as set forth.

8. The method of making an armaturecore, which consists in oxidizingiron wire by passing it through an oxidizing agent and winding it intoan annular coil, substantially as set forth.

9. The method of making an armaturecore, which consists in oxidizing anumber of iron wires by passing them through an oxidizing agentandwinding the same simultaneously into an annular coil, substantiallyas set forth.

This specification signed and witnessed this 31st day of August, 1888.

. THOS. A. EDISON. Witnesses.

WILLIAM PELZER, ALFRED W. KIDDLE.

